Note:- cloudbeds is rather expensive for a small hotel. their recommended package, less than 10 rooms, is 129€ and surely IVA is not include so add another 21% if you're in Spain.
I suggest using the recommended unscented bleach to water solution. Then you won't have any odors to be concerned about.
Quite complicated is the answer. I have been working with one called "otelsMS' for a few months now on a one year trial basis and I am not 100% pleased with the service. Have recently been researching other providers but it is difficult to discern which would be most suitable in both functionality and economically. I have a small hotel with just eight rooms so a grand channel manager service is not required but a reliable one would be helpful. With this one, after launching with connections to only Booking.com and Expedia, in January they tried to get my Airbnb listings on-line and completely screwed it up to the point where one of my rooms disappeared from Airbnb and I almost lost paid for images. Not impressed that they only speak Spanish which makes it a bit more complicated for me even though it appears they are a Bulgarian company.